Black Eye Agate 4mm Round - 15-16 Inch Eagle a green-colored mineral

a green-colored mineral

and variation of the amount of iron in the stone creates a color range from reddish purple to deep violet to light lilac

The name originates from the town of Larvik

and it can be mottled or striated with veins of these colors

Black Eye Agate 4mm Round - 15-16 Inch Eagle a green-colored mineralBlack Eye Agate is a variety of Sardonyx which has a Sard base, typically of brown or black, with bands of white Onyx running through it. Sard is not Onyx, but rather a dark variety of Carnelian. Sardonyx is sometimes treated to bring out its reddish tones. It is believed by some to improve memory and increase analytical skills.